Roundcube webmail shows a blank page. The following error can be seen in
[error]PHP Warning: Configuration error. Unsupported database driver: in /usr/share/psa-roundcube/program/lib/Roundcube/rcube.php on line 1160
The Apache mod_fcgid module is not installed on the server.
The fact that mod_fcgid is not installed as a dependent package is considered as software issue. The issue's ID is PPPM-1333 .
The issue is planned to be fixed in a further Parallels Plesk update.
Install the mod_fcgid module from
/usr/local/psa/admin/sbin/autoinstaller. The module is available under
Plesk hosting features.
Enable the module under the the Parallels Plesk > Tools & Settings > Apache Webserver > Apache-Module
Make sure that suexec is enabled as Apache-Modules as well.